Seoul, South Korea Kolkata, India

Seoul is in the KST timezone (UTC+9) and Kolkata is in the IST timezone (UTC+5:30). The time difference between them is 3h 30m.

Use the timeline above to find overlapping business hours between Seoul and Kolkata. The "Best time to meet" card highlights the window where both cities are within working hours (9 AM – 6 PM local time).

Neither Seoul nor Kolkata observes Daylight Saving Time, so the time difference remains constant throughout the year.

Click the pencil icon next to the Seoul clock and type any time. The Kolkata clock will update instantly, showing the exact corresponding time. You can also pick a date to account for DST changes.